Motion-compensated subsampling of HDTV
Ricardo A. F. Belfor, Reginald L. Lagendijk, Jan Biemond · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1991
For an economical introduction of HDTV a substantial datareduction is necessary, while maintaining the high image quality. To this end Sub-Nyquist techniques can be used (MUSE, HD-MAC) for stationary parts of the image, spreading the sampling of one complete frame over several frames and combining these different frames at the receiver. Without special precautions Sub-Nyquist sampling is not possible for moving areas of the image, in this paper a new algorithm will be described for the subsampling of moving parts of a video sequence. The advantage of this new method is that the full spatial resolution can be preserved, while also maintaining the full temporal resolution. To prevent aliasing at certain velocities ( critical velocities ), the image is divided into a high-pass and a low-pass part prior to subsampling. At the receiver a motion compensated interpolation filter is used to reconstruct the original image.